utime(2) - phpMan

UTIME(2)                   Linux Programmer's Manual                  UTIME(2)



NAME
       utime, utimes - change access and/or modification times of an inode

SYNOPSIS
       #include <sys/types.h>
       #include <utime.h>

       int utime(const char *filename, const struct utimbuf *buf);


       #include <sys/time.h>

       int utimes(const char *filename, const struct timeval times[2]);

DESCRIPTION
       utime()  changes  the access and modification times of the inode specified by file-
       name to the actime and modtime fields of buf respectively.

       If buf is NULL, then the access and modification times of the file are set  to  the
       current time.

       Changing  time  stamps is permitted when: either the process has appropriate privi-
       leges (Linux: has the CAP_FOWNER capability), or the effective user ID  equals  the
       user  ID  of  the file, or buf must is NULL and the process has write permission to
       the file.

       The utimbuf structure is:

              struct utimbuf {
                  time_t actime;       /* access time */
                  time_t modtime;      /* modification time */
              };

       The function utime() allows specification of time stamps with  a  resolution  of  1
       second.   The  function utimes() is similar, but allows a resolution of 1 microsec-
       ond.  Here times[0] refers to access time, and times[1] to modification time.

       The timeval structure is:

              struct timeval {
                  long tv_sec;        /* seconds */
                  long tv_usec;       /* microseconds */
              };

RETURN VALUE
       On success, zero is returned.  On error, -1 is returned, and errno is set appropri-
       ately.

ERRORS
       EACCES Search permission is denied for one of the directories in the path prefix of
              path (see also path_resolution(2)), or buf is NULL and the process does  not
              have permission to change the time stamps (see above).

       ENOENT filename does not exist.

       EPERM  buf  is not NULL and the process does not have permission to change the time
              stamps.

       EROFS  path resides on a read-only file system.

NOTES
       Linux does not allow changing the time stamps on an immutable file, or setting  the
       time stamps to something other than the current time on an append-only file.

       In libc4 and libc5, utimes() is just a wrapper for utime() and hence does not allow
       a subsecond resolution.

       POSIX.1-2001 marks utimes() legacy, which is strange since it provides  more  func-
       tionality than utime().

BUGS
       Linux is not careful to distinguish between the EACCES and EPERM error returns.  On
       the other hand, POSIX.1-2001 is buggy in its error description for utimes().

CONFORMING TO
       utime(): SVr4, POSIX.1-2001.
       utimes(): 4.3BSD

SEE ALSO
       chattr(1), futimesat(2), stat(2), futimes(3)



Linux 2.6.8                       2004-10-10                          UTIME(2)

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